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                [Sdoi2017]新生舞会                </h1>
                <p>时间限制：10s&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;  空间限制：128MB</p>			</div>
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                                <h3>题目描述</h3><p><div>学校组织了一次新生舞会，Cathy作为经验丰富的老学姐，负责为同学们安排舞伴。有n个男生和n个女生参加舞会</div>
<div>买一个男生和一个女生一起跳舞，互为舞伴。Cathy收集了这些同学之间的关系，比如两个人之前认识没计算得出&nbsp;</div>
<div>a[i][j] ，表示第i个男生和第j个女生一起跳舞时他们的喜悦程度。Cathy还需要考虑两个人一起跳舞是否方便，</div>
<div>比如身高体重差别会不会太大，计算得出 b[i][j]，表示第i个男生和第j个女生一起跳舞时的不协调程度。当然，</div>
<div>还需要考虑很多其他问题。Cathy想先用一个程序通过a[i][j]和b[i][j]求出一种方案，再手动对方案进行微调。C</div>
<div>athy找到你，希望你帮她写那个程序。一个方案中有n对舞伴，假设没对舞伴的喜悦程度分别是a'1,a'2,...,a'n，</div>
<div>假设每对舞伴的不协调程度分别是b'1,b'2,...,b'n。令</div>
<div>C=(a'1+a'2+...+a'n)/(b'1+b'2+...+b'n),Cathy希望C值最大。</div>
<div></div></p><hr/><h3>输入格式</h3><p><div>第一行一个整数n。</div>
<div>接下来n行，每行n个整数，第i行第j个数表示a[i][j]。</div>
<div>接下来n行，每行n个整数，第i行第j个数表示b[i][j]。</div>
<div>1&lt;=n&lt;=100,1&lt;=a[i][j],b[i][j]&lt;=10^4</div>
<div></div></p><hr/><h3>输出格式</h3><p><div>一行一个数，表示C的最大值。四舍五入保留6位小数，选手输出的小数需要与标准输出相等</div>
<div></div></p><hr/><h3>样例输入</h3><pre>3
19 17 16
25 24 23
35 36 31
9 5 6
3 4 2
7 8 9</pre><hr/><h3>样例输出</h3><pre>5.357143</pre><hr/><h3>提示</h3><p>没有写明提示</p><hr/><h3>题目来源</h3><p>鸣谢infinityedge上传</p>
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